STM32F407 SPI uSD CARD Interfacing gives FR_NOT_READY and firmware hangs

[YKees.1]

Hello,

I have been trying out interfacing the STM32F407 Discovery Kit with different sensors but while trying to Interface a SPI uSD card adaptor containing a 16GB microSD card, the interfacing doesn't seem to work out at all.

I have followed all the different available tutorials like this, this (exact setup with STM32F407 kit) and this.

I have 3-4 different firmware, added the fatfs_sd lib files as well in all, and made the necessary changes as mentioned in the above tutorials.

I have also looked at the STCommunity thread, but didn't help.

But the f_mount() always fails with FR_NOT_READY when used like 'f_mount(&fs, "", 1)' or the f_open() function fails with FR_NOT_READY when the f_mount() is used like 'f_mount(&fs, "", 0)'.

I am clueless and not able to understand what is the issue after trying multiple youtube tutorials and blogs.

Please help. This is blocking some other pending tasks.

PS: Attached 47K resistors to the MISO and MOSI lines after reading at multiple posts, but that didn't help too.

ATTACHED FIRMWARE for reference.

Regards,

Yash

[YKees.1]

Can someone please help, if they have expertise in the above-said interfacing or if they interfaced an SD card module with STM32F407 successfully?

[Tesla DeLorean]

In this code probably that the interface hasn't been initialized.

Perhaps instrument the user_diskio.c code to understand the flow.

Most use the Adafruit SPI implementation

STM32Cube_FW_F4_V1.24.0\Drivers\BSP\Adafruit_Shield\stm32_adafruit_sd.c

On the F4 one might go with SDIO as it is markedly faster and more robust.

Best to start with working examples you can port, than broken examples you must debug

[YKees.1]

Hello Tesla DeLorean,

Thank you for your response.

I did try with the SDIO 1-bit mode just to test it out and also because the interface of SDIO 1-bit and SPI implementation is similar (same SPI module used).

But the 1-bit SDIO mode also gave the same FR_NOT_READY error irrespective of changing the SD_Detect pin.

Will try to import the Adafruit lib and see if it helps.

Regards,

Yash